Release structure for a fixture

Abstract

A release structure for a fixture contains: a support assembly including a first support arm, a second support arm, and a connecting rod; the connecting rod being inserted through the first support arm and the second support arm, such that a clamping space forms between the first support arm and the second support arm, and the first support arm having an abutting face so as to abut against the wooden workpiece; a force mechanism including a screw post screwing with the second support arm and a forcing post fitted with and rotating relative to the screw post. The screw post has a first inclined face to correspond to the forcing post and has a clamp head to mate with the wooden workpiece. The forcing post has a resilient element and a stop block. The stop block has a second inclined face to mesh with the first inclined face.

What is claimed is: 
     
         1 . A release structure for a fixture comprises:
 a support assembly including a first support arm, a second support arm, and a connecting rod; the connecting rod being inserted through one end of the first support arm and one end of the second support arm, such that a clamping space forms between the first support arm and the second support arm so as to place a wooden workpiece, and the first support arm having an abutting face defined on a bottom surface of another end thereof and facing to the clamping space so as to abut against the wooden workpiece;   a force mechanism including a screw post screwing with another end of the second support arm and a forcing post fitted with and rotating relative to the screw post; the screw post having a first inclined face formed on a bottom end thereof so as to correspond to the forcing post and having a clamp head fixed on an top end thereof so as to mate with the wooden workpiece; the forcing post having a resilient element and a stop block, both of which are disposed in the forcing post and abut against each other; the stop block having a second inclined face defined on a top end thereof opposite to the resilient element and meshing with the first inclined face of the screw post;   thereby, when rotating the forcing post, the first inclined face meshes with the second inclined face so as to drive the screw post to move, such that the clamping space is pressed or released so as to clamp or unclamp the wooden workpiece, and when an operation force is over a load range of the resilient element, the stop block presses the resilient element so that the first inclined face disengages from the second inclined face, hence the screw post stops clamping the wooden workpiece.   
     
     
         2 . The release structure for the fixture as claimed in  claim 1 , wherein the first inclined face is a first toothed portion, and the second inclined face is a second toothed portion defined, wherein the first toothed portion engages with or disengages from the second toothed portion of the stop block. 
     
     
         3 . The release structure for the fixture as claimed in  claim 1 , wherein the screw post also has a peripheral recess formed adjacent to the bottom end thereof, and the forcing post also has at least one positioning bolt for inserting through the peripheral recess so that the screw post is fixed by the at least one positioning bolt without remove from the forcing post. 
     
     
         4 . The release structure for the fixture as claimed in  claim 1 , wherein the second support arm and the connecting rod slide relative to each other, the second support arm has at least one limit retainer retained therein, and a caliber of the at least one limit retainer is slightly over the connecting rod so as to preserve a displacement tolerance which only produces as the second support arm is perpendicular to the connecting rod. 
     
     
         5 . The release structure for the fixture as claimed in  claim 1 , wherein the forcing post also has a handle sleeve fitted therearound. 
     
     
         6 . The release structure for the fixture as claimed in  claim 1 , wherein the second support arm further has a threaded hole defined in another end thereof, and the screw post has a threaded section arranged between the top end and the bottom end thereof so as to screw with the threaded hole of the second support arm.